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LLVM backend for 6502
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Scott Michel 0123b7dcfa Make tblgen a little smarter about constants smaller than i32. Currently, 
tblgen will complain if a sign-extended constant does not fit into a
data type smaller than i32, e.g., i16. This causes a problem when certain
hex constants are used, such as 0xff for byte masks or immediate xor
values.

tblgen will try the sign-extended value first and, if the sign extended
value would overflow, it tries to see if the unsigned value will fit.
Consequently, a software developer can now safely incant:

	(XORHIr16 R16C:$rA, 0xffff)

which is somewhat clearer and more informative than incanting:

	(XORHIr16 R16C:$rA, (i16 -1))

even if the two are bitwise equivalent.

Tblgen also outputs the 64-bit unsigned constant in the generated ISel code
when getTargetConstant() is invoked.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47188 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-15 23:05:48 +00:00
autoconf Remove use of ltdl 2008-02-13 17:11:39 +00:00
bindings Modify Makefile.rules to allow makefiles to prepend to C.Flags and 2008-01-06 21:54:35 +00:00
docs simplify this. 2008-02-15 22:57:17 +00:00
examples remove attributions from examples. 2007-12-29 20:37:57 +00:00
include Make tblgen a little smarter about constants smaller than i32. Currently, 2008-02-15 23:05:48 +00:00
lib Make tblgen a little smarter about constants smaller than i32. Currently, 2008-02-15 23:05:48 +00:00
projects remove attributions from the rest of the llvm makefiles. 2007-12-29 20:11:13 +00:00
runtime Fixing the stack walker. 2008-01-24 05:16:36 +00:00
test Modify test to expect improved code. 2008-02-15 22:05:15 +00:00
tools PR2027, Fix bugpoint's -find-bugs option, clean up the code. 2008-02-14 05:01:46 +00:00
utils Make tblgen a little smarter about constants smaller than i32. Currently, 2008-02-15 23:05:48 +00:00
website Prepare for "core" website. 2007-08-03 05:43:35 +00:00
win32 Rename MRegisterInfo to TargetRegisterInfo. 2008-02-10 18:45:23 +00:00
Xcode Rename CFEBuildInstrs.html to GCCFEBuildInstrs.html. 2008-02-14 17:53:22 +00:00
build-for-llvm-top.sh Allow the configure options to be set according to the llvm-top options. 2007-08-31 19:53:42 +00:00
configure Remove use of ltdl 2008-02-13 17:11:39 +00:00
CREDITS.TXT Update credits. 2007-12-11 09:32:07 +00:00
LICENSE.TXT scoped_ptr.h was removed. 2008-02-09 22:50:06 +00:00
llvm.spec.in * llvm.spec.in: update blurb 2007-07-13 09:48:29 +00:00
Makefile remove attributions from the rest of the llvm makefiles. 2007-12-29 20:11:13 +00:00
Makefile.common remove attributions from the rest of the llvm makefiles. 2007-12-29 20:11:13 +00:00
Makefile.config.in improve compatibility with mingw, patch by Alain Frisch 2008-01-15 22:50:50 +00:00
Makefile.rules Make the check for GCC version more robust, fix shared library 2008-02-05 19:43:40 +00:00
ModuleInfo.txt Update to include clean and install commands. 2007-07-20 20:54:41 +00:00
README.txt test 2007-04-20 20:49:25 +00:00

README.txt 

Low Level Virtual Machine (LLVM)
================================

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LLVM is open source software. You may freely distribute it under the terms of
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Please see the HTML documentation provided in docs/index.html for further
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